SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bc6d06906a152558fb8415a998b9126e9ccd6f90eef94a78bf8737b58e5635' 
  AND token = 'XDtQDy8ngkMPEd0AVj0iBrqeoD/BSe08TuJNbRJNhaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables